| Redwood Collections Ltd | Administrative & support | 2009 |
| Redwood Management Limited | Households | 1984 |
| Redwood Park (Management Company) Limited | Professional & scientific | 2015 |
| Reecegoldsmithpd Limited | Construction | 2026 |
| Reedworth Ventures Ltd | Wholesale & retail | 2023 |
| Reef Creative Group Ltd | Financial services | 2022 |
| Reef Entertainment Limited | Information & communication | 2005 |
| Reeler Property Group Ltd | Real estate | 2020 |
| Reelup Ltd | Information & communication | 2022 |
| Reen London Ltd | Wholesale & retail | 2026 |
| Rees Elliott Chichester Road Limited | Construction | 2006 |
| Reeves Corner OFF Licence Ltd | Wholesale & retail | 2012 |
| Refashioned Ltd | Wholesale & retail | 2024 |
| Refine 9 Ltd | Real estate | 2023 |
| Refinestart Limited | Hospitality | 2021 |
| Reflect Adapt Ltd | Information & communication | 2019 |
| Reformer Pilates London Limited | Arts & recreation | 2026 |
| Refteck Solutions Limited | Other services | 2007 |
| Refurbished Electronics Limited | Other services | 2016 |
| Regaine Investments Ltd | Real estate | 2025 |
| Regal Bands Ltd | Wholesale & retail | 2020 |
| Regal Capital Management Ltd | Financial services | 2023 |
| Regal Nails 00 Limited | Other services | 2024 |
| Regalpoint Management Company Limited | Real estate | 2006 |
| Regatta House (Teddington) RTM Company Limited | Households | 2016 |
| Regatta Point (Freehold) Limited | Households | 2002 |
| Regbea Ltd | Administrative & support | 2022 |
| Regency Court (Bedford) Management Company Limited | Households | 2002 |
| Regency Healthcare Services Ltd | Health & social care | 2021 |
| Regency Heights (First Central) Management Company Limited | Real estate | 2018 |
| Regency Place (Cheltenham) Management Company Limited | Households | 2015 |
| Regency U.K. Estates Ltd | Real estate | 2023 |
| Regenesisspa Limited | Other services | 2018 |
| Regenity Ltd | Wholesale & retail | 2008 |
| Regent and Foundry Court Management Company Limited | Households | 1988 |
| Regent Financial Solutions Ltd | Professional & scientific | 2025 |
| Regent Street Orthodontics Limited | Health & social care | 2014 |
| Regents Place Community Energy Company Limited | Households | 2014 |
| Regents Place Freehold Limited | Extraterritorial | 2015 |
| Regents Place Residents Association Limited | Households | 2004 |
| Regents Place Residents Management Company Limited | Households | 2014 |
| Regents Quay Management Company Limited | Households | 2018 |
| Regera Limited | Information & communication | 2019 |
| Regfar Ltd | Information & communication | 2020 |
| Reggae Kitchen Ltd | Hospitality | 2018 |
| Reggie Consulting Ltd | Administrative & support | 2019 |
| Regimen Gym Equipment Limited | Wholesale & retail | 2020 |
| Regina Uniqueness Home Care Ltd | Health & social care | 2026 |
| Reginova Aesthetics Ltd | Health & social care | 2026 |
| Reginova Medical Ltd | Health & social care | 2025 |
| Regional Housing Limited | Real estate | 2013 |
| Regius and Partners Ltd | Professional & scientific | 2026 |
| Rehman Food Stores Limited | Wholesale & retail | 2011 |
| Rehman Services Ltd | Transport & logistics | 2025 |
| Rehman's Store Limited | Wholesale & retail | 2025 |
| Rehmat Ltd | Construction | 2025 |
| Rehoboth AZ Limited | Transport & logistics | 2019 |
| Reidyfibre Ltd | Information & communication | 2024 |
| Reignline Limited | Wholesale & retail | 2023 |
| Reiki Restore Croydon Ltd | Wholesale & retail | 2025 |
| Rejoice Limited | Other services | 2010 |
| Rejuvenate Studios Limited | Information & communication | 2011 |
| REL Engineering Ltd | Professional & scientific | 2022 |
| Relax Network Ltd | Other services | 2024 |
| Relaxare Ltd | Wholesale & retail | 2025 |
| Relaxedrental Ltd | Real estate | 2023 |
| Relentless Hustle Ltd | Other services | 2013 |
| Relevare Limited | Administrative & support | 2021 |
| Reliable Healthcare Services Ltd | Health & social care | 2019 |
| Reliable Residences Ltd | Real estate | 2024 |
| Relief Creche Care Ltd | Health & social care | 2012 |
| Remax Ltd | Construction | 2023 |
| Remcourt Limited | Real estate | 2014 |
| Remedium Clinic Limited | Health & social care | 2023 |
| Reminiscence Rooms Ltd | Real estate | 2022 |
| REMKIT2 Limited | Hospitality | 2018 |
| Remminy Global Concept Ltd | Other services | 2019 |
| Remote Choice Ltd | Other services | 2022 |
| Remoteplus Ltd | Information & communication | 2019 |
| Removals and Storage Solutions Limited | Transport & logistics | 2014 |
| Remy's Limited | Real estate | 1984 |
| REN Real Estate Ltd | Real estate | 2024 |
| Renaissance (Addlestone) Management Company Limited | Households | 2011 |
| Renaissance Court (Sutton) Management Company Limited | Households | 2003 |
| Renap Healthcare Limited | Health & social care | 2022 |
| Renata Properties Ltd | Construction | 2024 |
| Renee's Kitchen Limited | Hospitality | 2025 |
| Renew ALL Limited | Construction | 2010 |
| Renew-Co Engineering Ltd | Construction | 2014 |
| Reni Care Personnel Ltd | Health & social care | 2017 |
| Renil Limited | Transport & logistics | 2014 |
| Renivara Limited | Construction | 2025 |
| Rennie Realtors Ltd | Real estate | 2019 |
| Rennisons Yard (Bristol) Management Company Limited | Households | 2021 |
| Rent Empty Ltd | Construction | 2019 |
| Renyil Properties Ltd | Real estate | 2018 |
| Renzo Capital Ltd | Real estate | 2025 |
| REO Management Limited | Administrative & support | 2017 |
| Repertoire Culinaire Limited | Wholesale & retail | 1982 |
| Repp Limited | Construction | 2022 |